Hello!
A little bunch of fixes for audio/L16 mime type handling:
0001 - RFC 2045 says MIME type should be case insensitive;
0002 - RFC 2586 says audio/L16 should be in network byte order (aka big
endian);
0003 - though "endiannes" parameter not in RFC it is widely used;
From e40e9567995042d75f8070daaa2efde46409f877 Mon Sep 17 00:00:00 2001
From: Igor Derzhavin
Date: Thu, 22 Nov 2018 10:38:20 +0300
Subject: [PATCH 1/3] avformat/pcmdec: mime-type should be case insensitive
(audio/L16)
---
libavformat/pcmdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/pcmdec.c b/libavformat/pcmdec.c
index bd2a0384f8..0d146a46a0 100644
--- a/libavformat/pcmdec.c
+++ b/libavformat/pcmdec.c
@@ -52,7 +52,7 @@ static int pcm_read_header(AVFormatContext *s)
if (mime_type && s->iformat->mime_type) {
int rate = 0, channels = 0;
size_t len = strlen(s->iformat->mime_type);
-if (!strncmp(s->iformat->mime_type, mime_type, len)) {
+if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) {
uint8_t *options = mime_type + len;
len = strlen(mime_type);
while (options < mime_type + len) {
--
2.17.1
From 4aa886c8941086d5290c10439a4a822538ec61e8 Mon Sep 17 00:00:00 2001
From: Igor Derzhavin
Date: Thu, 22 Nov 2018 10:54:42 +0300
Subject: [PATCH 3/3] avformat/pcmdec: endianness for audio/L16 mime type
---
libavformat/pcmdec.c | 12 ++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/libavformat/pcmdec.c b/libavformat/pcmdec.c
index 8530dbc1e3..9895af03a4 100644
--- a/libavformat/pcmdec.c
+++ b/libavformat/pcmdec.c
@@ -50,9 +50,9 @@ static int pcm_read_header(AVFormatContext *s)
av_opt_get(s->pb, "mime_type", AV_OPT_SEARCH_CHILDREN, &mime_type);
if (mime_type && s->iformat->mime_type) {
-int rate = 0, channels = 0;
+int rate = 0, channels = 0, little_endian = 0;
size_t len = strlen(s->iformat->mime_type);
-if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) {
+if (!av_strncasecmp(s->iformat->mime_type, mime_type, len)) { /* audio/L16 */
uint8_t *options = mime_type + len;
len = strlen(mime_type);
while (options < mime_type + len) {
@@ -63,6 +63,12 @@ static int pcm_read_header(AVFormatContext *s)
sscanf(options, " rate=%d", &rate);
if (!channels)
sscanf(options, " channels=%d", &channels);
+if (!little_endian) {
+ char val[14]; /* sizeof("little-endian") == 14 */
+ if (sscanf(options, " endianness=%13s", val) == 1) {
+ little_endian = strcmp(val, "little-endian") == 0;
+ }
+}
}
if (rate <= 0) {
av_log(s, AV_LOG_ERROR,
@@ -74,6 +80,8 @@ static int pcm_read_header(AVFormatContext *s)
st->codecpar->sample_rate = rate;
if (channels > 0)
st->codecpar->channels = channels;
+if (little_endian)
+st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
}
}
av_freep(&mime_type);
--
2.17.1
From 817fd71b9c87d019996d711d47517994c55636b1 Mon Sep 17 00:00:00 2001
From: Igor Derzhavin
Date: Thu, 22 Nov 2018 10:39:57 +0300
Subject: [PATCH 2/3] avformat/pcmdec: audio/L16 should be in network byte
order by default (rfc 2586)
---
libavformat/pcmdec.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavformat/pcmdec.c b/libavformat/pcmdec.c
index 0d146a46a0..8530dbc1e3 100644
--- a/libavformat/pcmdec.c
+++ b/libavformat/pcmdec.c
@@ -142,10 +142,10 @@ PCMDEF(s24le, "PCM signed 24-bit little-endian",
NULL, AV_CODEC_ID_PCM_S24LE)
PCMDEF(s16be, "PCM signed 16-bit big-endian",
- AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE)
+ AV_NE("sw", NULL), AV_CODEC_ID_PCM_S16BE, .mime_type = "audio/L16")
PCMDEF(s16le, "PCM signed 16-bit little-endian",
- AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE, .mime_type = "audio/L16",)
+ AV_NE(NULL, "sw"), AV_CODEC_ID_PCM_S16LE)
PCMDEF(s8, "PCM signed 8-bit",
"sb", AV_CODEC_ID_PCM_S8)
--
2.17.1
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